Privateer, privately owned armed vessel commissioned by a belligerent state to attack enemy ships, usually vessels of commerce. Privateering was carried on by all nations from the earliest times until the 19th century. Crews were not paid by the commissioning government but were entitled to cruise for their own profit, with crew members receiving portions of the value of any cargo or shipping that they could wrest from the original owners. Frequently, it was impossible to restrain the activities of privateers within the legitimate bounds laid down in their commissions. Thus, it often became difficult to distinguish between privateers, pirates, corsairs, or buccaneers, many of whom sailed without genuine commissions.

In the late 16th century, English privateers such as Sir John Hawkins and Sir Francis Drake were encouraged or restrained, according to prevailing political conditions. With the growth of a regular navy, however, the British Admiralty began to discourage privateering because it was more popular among sailors than was serving in the navy. At this same period, Dutch Sea Beggars and French Huguenot privateers were active. Throughout the 17th century, English buccaneers in the West Indies, such as Sir Henry Morgan, sometimes sailed as genuine privateers. From 1690, French privateers from Dunkerque (Dunkirk) and Saint-Malo were particularly active against English commerce. During the American Revolution the American colonists found it difficult to form a new navy because more than 1,000 privateers were already licensed. The popularity of privateering continued in the War of 1812 between Great Britain and the United States when, for example, the U.S. brig Yankee alone seized or destroyed $5,000,000 worth of English property. France used many privateers during the French revolutionary and Napoleonic wars.

In 1856, by the Declaration of Paris, Great Britain and the other major European countries (except Spain) declared privateering illegal. The U.S. government refused to accede, holding that the small size of its navy made reliance on privateering necessary in time of war. The rise of the American navy at the end of the 19th century and the realization that privateering belonged to an earlier form of warfare prompted the United States to recognize the necessity of finally abolishing it. Spain agreed to the ban in 1908.

At the Hague Peace Conference of 1907 it was then stipulated, and has since become part of international law, that armed merchant ships must be listed as warships, though there have been various interpretations of the word armed. The ambiguous status of the privateer has thus ceased to exist—the state now assumes full responsibility for all converted ships engaged in military operations.

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